Bug with CONCAT

[Helge Gabert]

Yes, good observation!

It appears, generally speaking, that vectors and lists are somewhat interchangeable in CAS (a concept that I don't like myself, but there it is).

For example, you can save the aforementioned vector of yours to a list, e.g.,

store [ 5 6 7 ] in L1. It works! Then, recall L1. Voila! Now it morphed into a list.

{5 6 7 }.

Funny . . .